I'm trying to connect to a remote device (which connect to my server on port 31200 via TCP) and while troubleshooting with ngrep I'm getting the following:
T(6) 2012/02/21 00:26:25.817525 220.127.116.11:37400 -> 18.104.22.168:31200 [S]
T(6) 2012/02/21 00:26:25.817556 22.214.171.124:31200 -> 126.96.36.199:37400 [AR]
Does anyone know what the [S] and [AR] stand for or where I can find further info, can't find anything after an hour of searching (my C is poor so can't look into the source of ngrep to figure things out)! Also would be good to know what the (6) stands for, I've read it's the subprotocol but what does it correspond to?